//ListenerSession.java
import javax.servlet.*;
import javax.servlet.http.*;

public class ListenerSession
implements HttpSessionListener {
public ListenerSession() {
}
public void sessionCreated(HttpSessionEvent sessionEvent) {
// Get the session that was created
HttpSession session = sessionEvent.getSession();
// Store something in the session, and log a message
try {
System.out.println("Session created: "+session);
session.setAttribute("dog", "labrador");
session.setAttribute("name", "Diana");
} catch (Exception e) {
System.out.println("Error in setting session attribute: " + 
e.getMessage());
}
}
public void sessionDestroyed(HttpSessionEvent sessionEvent) {
// Get the session that was invalidated
HttpSession session = sessionEvent.getSession();
// Log a message
System.out.println("Session invalidated: "+session);
System.out.println("The breed of the dog is: " + session.getAttribute("dog"));
System.out.println("The name of the dog is : " + session.getAttribute("name"));
}
}


//ServletListenerSession.java
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;

public class ServletListenerSession extends HttpServlet{
public void doGet(HttpServletRequest request, 
HttpServletResponse response) throws ServletException, IOException
{
response.setContentType("text/html");
PrintWriter pw = response.getWriter();
HttpSession session= request.getSession();
String str = (String)session.getAttribute("dog");
String dogName = (String)session.getAttribute("name");
pw.println("The breed of the dog is " + str);
pw.println("The name of the dog is " + dogName);
}
}